Factory unlock my iphone 4 to use in England for free?

I will be traveling in England in a couple of months and i want to be able to use my iphone 4 while I'm out there, does anyone know how I can unlock my phone so can be able to use it with vodafone, virgin or any other carrier while I'm in England?

Download the viber app, and it will work

Call your carrier and ask them to unlock it. Or get this network unlock code generator

http://networkunlock.org/iphone4/

I had trouble getting at&t to unlcok my iphone 4 and that did the trick.

Hope it works for you too.

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